The researchers studied the organic content in the exhaust of a gas turbine engine burning kerosene fuels. They focused on different types of organic compounds like polynuclear aromatic compounds, phenols, and nitrosamines. They collected particulate matter from the engine exhaust and analyzed it using various techniques. They found that most of the polynuclear aromatic compounds were small, with very few larger ones present. They did not detect any nitrosamines and found only low levels of phenols. The levels of organic compounds decreased with increasing engine power and were higher in exhaust from low sulfur fuels. Less than 1% of the organic matter emitted by the engine was absorbed on the particulate matter.